Jefferson Fidelis
Open to Software Engineering & AI roles

Jefferson Fidelis

|

Full-stack software engineer building AI-driven products — LLM applications, RAG pipelines, and real-time computer vision — end to end from architecture to production.

Jefferson Fidelis

4+

Years of experience

20+

Projects shipped

6

Companies collaborated with

3

AI / Computer Vision projects

Selected Work

Projects worth a closer look

A curated set of production and research projects — the full list, including smaller practice builds, lives on the Projects page.

View all projects
Hand-tracking drawing system rendering a line on screen as a finger moves in front of the camera
Artificial Intelligence

Vision-Based Drawing System

Touchless, gesture-based drawing using real-time hand tracking.

PythonOpenCVMediaPipeNumPy
Live video feed with bounding boxes, class labels, and confidence scores drawn around detected objects and people
Artificial Intelligence

Real-Time Object Detection

Real-time object and person detection with YOLOv4-Tiny on Darknet.

PythonDarknetYOLOv4-TinyOpenCV
Terminal output showing a CrewAI multi-agent run generating a travel itinerary and budget breakdown
Artificial Intelligence

Travel Planner — CrewAI

Multi-agent LLM orchestration that plans a trip itinerary and budget end to end.

PythonCrewAILLMspython-dotenv
GitPerfil search interface for looking up a GitHub user's public profile
Web Development

GitPerfil

A fast, focused GitHub profile explorer.

ReactGitHub REST API

Experience

Where I've shipped

Full-stack and AI engineering across a BI-focused federal data company, freelance AI product work, and a competitive front-end scholarship program.

Full resume

    May 2026Present

    Operations Analyst Jr. · Nefex

    Technology operations and internal tooling at Nefex, building automations and integrations that streamline processes and improve operational efficiency.

    Feb 2025Dec 2025

    Software Engineer (Freelance) · Sensilog

    Full-stack and AI engineering for client projects, from interactive front ends to production APIs and LLM-powered features.

    Apr 2024Jan 2026

    Business Intelligence Analyst (Intern) · Dataprev

    BI systems development at Brazil's federal social-security data-processing company, focused on data analysis and dashboarding.

AI Lab

Where AI meets production engineering

LLMs, retrieval-augmented generation, and computer vision — explored as engineering problems with real interfaces, not isolated experiments.

LLMs & Agents

Multi-agent orchestration with CrewAI, RAG pipelines, and LLM fine-tuning for domain-specific applications.

Computer Vision

Real-time detection and gesture-based interaction with YOLO, OpenCV, and MediaPipe.

Applied, not academic

Every AI project ties back to a concrete workflow or interface — not a standalone notebook.

Stack

Tools I reach for

Grouped by area rather than scored with arbitrary percentages — proficiency is better judged from the projects themselves.

Frontend

ReactNext.jsTypeScriptTailwind CSSFramer Motionshadcn/uiAngularHTML & CSS

Backend

Node.jsNestJSFastAPIPythonJavaDjangoSpring Boot

Data & Storage

PostgreSQLMySQLMongoDBRedisPrismaSQL

AI & Machine Learning

OpenAI APIGeminiCrewAILangChainRAGLLMsMCPMachine LearningComputer Vision

DevOps & Cloud

DockerAWSSupabaseGitHub Actions

Worked with teams at

Dataprev logoSensilog logoCompass UOL logoFábrica de Software UNIPÊ logoSão Braz logoPolícia Militar da Paraíba logo

Testimonials

What colleagues say

Let's build something worth shipping.

Open to Software Engineering and AI-focused roles, research collaborations, and interesting freelance work.